.html, body {
  /*width: 1200px;*/
  background-color: antiquewhite;
  color: #dee5ea;
}

.box{
  border-width: 2px;
  border-style: solid   ;
  border-color:#4798A5;
  /*分别为上→右→下→左 边框设置*/
  border-radius: 3%;
}
